Litter box



FIG. 1 is a top-right perspective view of a litter box.

FIG. 2 is a right-side elevation view of the litter box of FIG. 1.

FIG. 3 is a left-side elevation view of the litter box of FIG. 1.

FIG. 4 is a front elevation view of the litter box of FIG. 1.

FIG. 5 is a rear elevation view of the litter box of FIG. 1.

FIG. 6 is a top plan view of the litter box of FIG. 1; and,

FIG. 7 is a bottom plan view of the litter box of FIG. 1. 

We claim the ornamental design for a litter box, as shown and described. 